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Help; Check form input against .dat file

I am trying to password protect a few pages on my site. I'm currently using
a cgi program to gather customer information via a sign up page. All info
is directed to a .dat file.
Question: Using Form "get" how can i check the input from a login FORM against
the information in the .dat file. Then allowing access to the page. I guess
you would have to use some kind of IF string but I'm not that good. Please
Help!!!!!